Weather strip for automobile

Abstract

To provide a weather strip for an automobile, which can ensure high sealing performance between a flange and a vehicle outer wall of a welt part and improve molding work and assembling work performance.SOLUTION: This weather strip comprises: respectively provided at the tip 24a of a vehicle outer wall 24, a seal lip 36 that abuts against the vehicle outer side surface 08 of a flange and a first holding lip 27 disposed inside the seal lip to abut against the vehicle outer side surface of the flange when a welt part 22 is attached to the flange 05; provided in each outer surface of the seal lip and the first holding lip, an abutment 28 made of a sponge material which abuts against the vehicle outer side surface of the flange when the welt part is attached to the flange; and provided in the inner surface of the vehicle outer wall, a first protrusion 29 elastically contacted by the abutment of the first holding lip side.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a weather strip for an automobile that is attached to the periphery of a door opening on the vehicle body side and elastically contacts the periphery of the door to seal the interior and exterior of the vehicle. [Background technology]

[0002] A known example of a conventional weather strip for an automobile (hereinafter simply referred to as a weather strip) for this type of door opening is that described in Patent Document 1 below.

[0003] FIG. 1 is a perspective view of an automobile to which the present invention and a conventional automobile weatherstrip are applied, FIG. 6 is a cross-sectional view taken along line AA in FIG. 1 showing the conventional automobile weatherstrip with the door open, and FIG. 7 is a perspective view showing a clip used in the conventional automobile weatherstrip.

[0004] 1 and 6, the conventional weatherstrip 1 described in this publication is attached to a flange portion 05 made up of multiple overlapping metal body panels 04 formed along the periphery of a door opening 03 of, for example, a front door 02 in the body of an automobile 01. Specifically, it has an assembly base 2 formed in the shape of a thick plate and attached via multiple clips 4 to locking holes 07 drilled in the flange portion 05, and a hollow seal portion 3 formed integrally with the outer side surface of the assembly base 2 and elastically contacting the door panel 06 when the front door 02 is closed.

[0005] The mounting base 2 has an insertion hole 2a formed therethrough through which the clip 4 is inserted, and right-angle hook pieces 8 consisting of vertical pieces 6 and horizontal pieces 7 are provided along the longitudinal direction at both ends of the base plate 5, thereby forming a storage space 9 with an approximately rectangular cross section.

[0006] The hollow seal portion 3 is formed to have a substantially circular cross section in a free state, and when the door is closed, as described above, it is crushed and deformed by the elastic contact with the door panel 06, ensuring sealing performance.

[0007] As shown in Figure 7, the clip 4 has a large comb-tooth shaped seat plate 12 integrally formed at approximately the center of the longitudinal direction of the shaft portion 11 which is integral with the head portion 10, and a locking portion 13 which locks into the locking hole 07 of the flange portion 05 is provided at the tip of the shaft portion 11.

[0008] The mounting base 2 accommodates and holds the large seat plate 12 in the accommodation space 9 with the shaft 11 of the clip 4 inserted into the insertion hole 2a.

[0009] Then, with the mounting base 2 attached to the flange 05, the large seat plate 12 of the clip 4 and the vertical piece 6 of the right-angle hook 8 are firmly pressed against the exterior surface of the vehicle of the flange 05. This increases the mounting force of the weatherstrip 1 to the flange 05, ensuring sealing performance between the flange 05 and preventing water leakage into the vehicle interior.

[0010] The weatherstrip 1 has been described as being attached to the door opening 03 on the front door 02 side as shown in Figure 1, but the weatherstrip 1' attached to the door opening 03' on the rear door 02' side also has the same structure. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-200790 (see FIG. 3) Summary of the Invention [Problem to be solved by the invention]

[0012] As mentioned above, in the conventional automotive weatherstrip 1, the large base plate 12 of the clip 4 is firmly pressed against the outer surface of the flange 05 via the vertical piece 6 of the right-angle hook 8 to ensure a seal between the assembly base 2 and the flange 05. However, the assembly base 2 can only be pressed against the flange 05 at the locations where the clip 4 is provided; the assembly base 2 cannot be sufficiently pressed against the flange 05 at locations where the clip 4 is not provided. Therefore, a sufficient seal cannot be ensured between the assembly base 2 and the flange 05 at locations where the clip 4 is not provided.

[0013] For this reason, in areas where clips 4 are not provided, water can easily enter the vehicle between the flange portion 05 and the assembly base 2. In particular, in the event of a natural disaster such as a river overflowing due to flooding, if roads are flooded and the lower part of the front door 02 of the automobile 01 becomes submerged in water, when this water pressure is applied between the flange portion 05 and the assembly base 2, a gap may form between the flange portion 05 and the assembly base 2, allowing water, mud, etc. to enter the vehicle.

[0014] Furthermore, in the conventional weatherstrip 1, the clip 4 has a special structure, such as a large seat plate 12, which makes the molding process complicated. In addition, since the large seat plate 12 is housed inside the housing space 9 of the mounting base 2, the assembly process of the clip 4 is also complicated, which may result in a decrease in the efficiency of the molding and assembly processes and an increase in the costs of these processes.

[0015] The present invention was devised in consideration of the technical problems with the conventional automotive weatherstrips described above, and aims to provide an automotive weatherstrip that ensures high sealing performance between the flange portion and the exterior side wall of the welt portion, while also improving the efficiency of molding and assembly operations. [Means for solving the problem]

[0016] The invention described in claim 1 of the present application is an automotive weatherstrip comprising: a welt portion fitted onto a flange portion formed along the edge of a door opening in a vehicle body, the welt portion having a substantially U-shaped cross section formed by an interior side wall, an exterior side wall, and a connecting wall connecting both side walls; and a hollow seal portion formed integrally with the outer surface of the exterior side wall, with which the door panel elastically contacts when the door is closed; and the weatherstrip is characterized in that the weatherstrip is provided with a seal lip at the tip of the exterior side wall opposite the connecting wall, which abuts against the exterior side of the flange portion, and a first retaining lip located inside the seal lip and abutting against the exterior side of the flange portion; a contact portion made of sponge material that abuts against the exterior side of the flange portion when the welt portion is attached to the flange portion, and a first protrusion on the inner surface of the exterior side wall with which the abutment portion on the first retaining lip elastically contacts when the welt portion is attached to the flange portion. [Effects of the Invention]

[0017] According to the invention described in claim 1, the double seal between the seal lip and the first retaining lip and the high sealing performance of the abutting portion improve the sealing performance at any location between the flange and the welt of the body panel. In addition, it is possible to prevent a decrease in the efficiency of the molding and assembly work and reduce the costs of these work. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a perspective view of an automobile to which the present invention and a conventional automobile weather strip are applied; [Figure 2] 2 is a cross-sectional view taken along line AA in FIG. 1, showing a first embodiment of the weather strip for an automobile according to the present invention in a door-open state. [Figure 3] 2 is a cross-sectional view of the automotive weather strip of the present embodiment taken along line AA in FIG. 1 when the door is closed. [Figure 4] FIG. 4 is an enlarged view of part B in FIG. 3. [Figure 5]FIG. 10 is a cross-sectional view showing the outer side wall of the welt portion used in a second embodiment of the present invention. [Figure 6] 2 is a cross-sectional view taken along line AA in FIG. 1, showing a conventional weather strip for an automobile with the door open. [Figure 7] FIG. 2 is a perspective view showing a clip used in the conventional automotive weather strip. DETAILED DESCRIPTION OF THE INVENTION

[0019] An embodiment of an automotive weatherstrip according to the present invention will be described below with reference to the drawings. This weatherstrip 21 is applied to those attached to the periphery of the door openings of the front and rear doors of a vehicle body, but for the sake of convenience, the following description will focus on one attached to the periphery of the door opening 03 of the front door 02. [First embodiment of the present invention] FIG. 2 is a cross-sectional view taken along line AA in FIG. 1 showing a first embodiment of an automotive weatherstrip according to the present invention when the door is open, FIG. 3 is a cross-sectional view taken along line AA in FIG. 1 of the automotive weatherstrip of this embodiment when the door is closed, and FIG. 4 is an enlarged view of part B in FIG. 3.

[0020] As described above, the weatherstrip 21 is attached to the flange portion 05 of the body panel 04 formed along the periphery of the door opening 03 of the front door 02 of the automobile 01 shown in Fig. 1. This flange portion 05 is formed by overlapping, for example, three body panels 04 and joining them intermittently in the longitudinal direction by spot welding or the like. As shown in Figures 2 and 3, the weatherstrip 21 of this embodiment is fitted onto the flange portion 05 and has an inverted U-shaped welt portion 22 having an interior side wall 23, an exterior side wall 24, and a connecting wall 25 connecting these two side walls 23, 24, and a hollow seal portion 26 that is integrally formed on the outer surface of the exterior side wall 24 of the welt portion 22 and that elastically contacts a door panel 06 provided on the peripheral edge of the front door 02 when the front door 02 is closed, for example.

[0021] The welt portion 22 is integrally molded from a solid material, such as hard rubber or hard resin, to ensure rigidity, and has a metal core 22a with a U-shaped cross section embedded inside. The interior side wall 23 of the welt portion 22 has two interior retention lips 23a, 23b, one above the other, that protrude toward the exterior side wall 24 on the inner surface facing the interior side wall 24.

[0022] 2 to 4, the vehicle-exterior side wall 24 is provided with a seal lip 36 at its tip end 24a, which is the lower end in the drawings and located opposite the connecting wall 25, that abuts against the vehicle-exterior side surface 08 of the flange portion 05 when the welt portion 22 is attached to the flange portion 05, and a first retaining lip 27 at the tip end 24a located inside the seal lip 36. The seal lip 36 and first retaining lip 27 are molded from the same solid material as the welt portion 22, which is hard rubber or hard resin.

[0023] In the free state shown in Figure 2, the seal lip 36 is bent in a shape that extends toward the vehicle interior side wall 23. However, as shown in Figure 3, when the welt portion 22 is fitted onto the flange portion 05, the tip portion 36a is deformed downward into a straight line, so that the inner surface 36b of the tip portion 36a can abut against the vehicle exterior side surface 08 of the flange portion 05.

[0024] In the free state shown in Figure 2, the first retaining lip 27 is formed in an inclined shape toward the connecting wall 25, but as shown in Figure 3, when the welt portion 22 is fitted and attached to the flange portion 05, the tip portion 27a side is flexibly deformed toward the vehicle-exterior side wall 24, and the tip portion 27a and the inner surface 27b are formed so that they can abut against the vehicle-exterior side surface 08 of the flange portion 05.

[0025] Furthermore, the abutment portion 28 is provided continuously over the entire inner surface 36b of the seal lip 36 and the entire outer surface including the tip portion 27a of the first holding lip 27. That is, the abutment portion 28 covers the entire first holding lip 27 including the tip portion 27a with a sponge rubber material, and extends to the tip portion 36a of the inner surface 36b of the seal lip 36.

[0026] 2 to 4, a first protrusion 29 is provided on the inner surface of the exterior-side wall 24. When the welt portion 22 is fitted onto the flange portion 05, the back surface of the first retaining lip 27, which is flexibly deformed toward the exterior-side wall 24, elastically contacts the first protrusion 29 via the abutment portion 28. Like the exterior-side wall 24, the first protrusion 29 is made of hard rubber or hard resin and has a substantially L-shaped cross section. The first protrusion 29 extends along the longitudinal direction of the exterior-side wall 24.

[0027] A protrusion 30 is integrally formed on the inner surface of the exterior-side side wall 24 closer to the connecting wall 25 than the first protrusion 29, i.e., approximately in the center of the inner surface in the vertical direction in Figure 2, and comes into elastic contact with the exterior-side surface 08 of the flange portion 05 when the welt portion 22 is fitted onto and attached to the flange portion 05. This protrusion 30 is made of sponge rubber and has a tapered truncated cross section, and is formed to extend along the longitudinal direction of the exterior-side side wall 24.

[0028] Furthermore, a second retaining lip 31 is integrally formed on the inner surface of the exterior side wall 24 near the connecting wall 25. When the welt portion 22 is fitted onto the flange portion 05, the second retaining lip 31 flexes and deforms to abut against the exterior side surface of the flange portion 05. Like the welt portion 22, the second retaining lip 31 is made of hard rubber or hard resin material and is slightly thicker than the first retaining lip 27. The second retaining lip 31 also extends along the longitudinal direction of the exterior side wall 24.

[0029] Furthermore, a second protrusion 32 with which the back surface of the second retaining lip 31 elastically contacts is formed integrally with the inner surface of the exterior-side wall 24 near the connecting wall 25. That is, this second protrusion 32 is formed with a substantially L-shaped cross section and is made of the same hard rubber or hard resin material as the welt portion 22, so that when the welt portion 22 is fitted and attached to the flange portion 05, the second retaining lip 31 is flexed and deformed by the reaction force from one side surface of the flange portion 05, and its back surface elastically contacts the second protrusion 32. This second protrusion 32 also extends along the longitudinal direction of the exterior-side wall 24.

[0030] Therefore, when the welt portion 22 is fitted and attached to the flange portion 05, the respective tips of the two interior retaining lips 23a, 23b and the respective tips of the first and second retaining lips 27, 31 of the exterior side wall 24 elastically contact the interior side surface 09 and the exterior side surface 08 of the flange portion 05 in a clamping state, thereby stably and securely holding the welt portion 22 to the flange portion 05.

[0031] 2, a cover lip 33 extending toward the interior of the vehicle is integrally provided between the upper end of the interior side wall 23 of the welt portion 22 and the connecting wall 25. This cover lip 33 covers the leading end of interior materials 010 such as door trim and garnish that extend from the interior side toward the interior side wall 23.

[0032] As shown in Figure 2 in a free state, the hollow seal portion 26 is integrally formed from a sponge material and is tapered from both end portions 26a, 26b integrally joined to the outer surface of the exterior-side wall 24 to a tip portion 26c. One end portion 26a of the hollow seal portion 26 is joined to the vicinity of the tip portion 24a, which is the lower end portion in Figure 2 of the exterior-side wall 24, while the other end portion 26b is joined to the vicinity of the connecting wall 25 of the exterior-side wall 24. The other end portion 26b is formed from the same solid material as the welt portion 22, which is hard rubber or hard resin.

[0033] A linear support wall 34 is provided inside the hollow seal portion 26, dividing the hollow seal portion 26 into an interior seal portion at both end portions 26a, 26b and an exterior seal portion at the tip end 26c. The support wall 34 is made of sponge rubber, just like the hollow seal portion 26, and in its free state when the front door 02 is open, is formed as a linear, long plate extending across the interior center of the hollow seal portion 26, as shown in Fig. 2. A pair of protrusions 35a, 35b are integrally provided on the outer surface of the hollow seal portion 26 near the location where one end portion 34a of the support wall 34 is joined and on the tip end 26c side.

[0034] As shown in Figure 3, when the front door 02 is closed, the door panel 06 elastically contacts the respective protrusions 35a, 35b on the tip end 26c side of the hollow seal portion 26, causing the tip end 26c side to be crushed and deformed. As a result, the support wall 34 also moves toward the interior of the vehicle, and the one end 34a side elastically contacts the protrusion 26d provided on the other end 26b of the hollow seal portion 26. [Functions and Effects of the Weatherstrip According to the Present Embodiment] The effects of the weatherstrip 21 according to this embodiment will be described below.

[0035] In this embodiment, as shown in Fig. 3, when the welt portion 22 is fitted onto the flange portion 05 of the vehicle-body panel 04, the two interior retaining lips 23a, 23b of the interior side wall 23 are flexibly deformed upward and come into elastic contact with the interior side surface 09 of the flange portion 05 of the vehicle-body panel 04. Meanwhile, on the exterior side wall 24 side, as shown in Figs. 3 and 4, the tip end 36a of the seal lip 36 comes into elastic contact with the exterior side surface 08 of the flange portion 05 via the abutment portion 28, and the tip end 27a of the first retaining lip 27 also comes into elastic contact with the exterior side surface 08 of the flange portion 05 via the abutment portion 28. At this time, the back side of the first retaining lip 27 comes into elastic contact with the first protrusion 29 via the abutment portion 28, and the reaction force causes the abutment portion 28 to fit the curved shape of the exterior side surface 08 and come into elastic contact in close contact.

[0036] In this way, the abutment portion 28 elastically contacts the exterior side surface 08 of the flange portion 05 in a tight contact state by the seal lip 36 and the first retaining lip 27, and a double seal is obtained by the seal lip 36 and the first retaining lip 27, ensuring high sealing performance. In addition, the first retaining lip 27 elastically contacts the exterior side surface 08 via the abutment portion 28 with a reaction force applied by the first protrusion 29, further improving sealing performance.

[0037] Therefore, for example, if a road is flooded due to a river overflowing due to a flood or the like and the lower parts of the doors 02, 02' of the automobile 01 are submerged in water, even if this water pressure W is applied between the outer side surface 08 of the flange portion 05 and the tip portion 24a of the outer side wall 24 as shown by the arrow in Figure 3, the abutment portion 28 of the seal lip 36 and the first retaining lip 27 can effectively prevent water from entering the passenger compartment.

[0038] In particular, in this embodiment, the abutment portion 28 made of sponge rubber material is continuously formed on the outer surfaces of the seal lip 36 and the first retaining lip 27, and this abutment portion 28 provides flexible adhesion to the vehicle exterior side surface 08 of the flange portion 05, thereby further improving the sealing performance.

[0039] At the same time, the tip 30a of the sponge material protrusion 30 elastically contacts the vehicle exterior side surface 08 of the flange portion 05 in a tight, tight state, thereby providing sealing properties, and the second retaining lip 31 flexes and deforms rearward to elastically contact the second protrusion 32, increasing the reaction force of the second retaining lip 31 toward the flange portion 05, and this reaction force increases the adhesion force to the vehicle exterior side surface 08, thereby providing high sealing performance.

[0040] In this way, the protrusion 30 and the second retaining lip 31 further improve the sealing performance between the outer side surface 08 of the flange portion 05, so that even if the water pressure W is applied between the outer side surface 08 of the flange portion 05 and the tip portion 24a of the outer side wall 24, it is possible to more effectively prevent the water from entering the passenger compartment.

[0041] Furthermore, in this embodiment, rather than ensuring sealing by changing the structure of the clip in addition to the welt portion as in the prior art, the sealing lip 36, first retaining lip 27, abutment portion 28 and first protrusion 29, as well as protrusion 30, second retaining lip 31 and second protrusion 32 are provided integrally with the welt portion 22, and these can be provided together during extrusion molding of the welt portion 22, for example, thereby improving the efficiency of the molding work and reducing the work costs.

[0042] Furthermore, since the seal lip 36 and the first retaining lip 27 are formed from hard rubber or hard resin, they are ensured to have sufficient rigidity, allowing them to come into elastic contact with the outer side surface of the vehicle with a relatively large elastic force.

[0043] 3, when the front door 02 is closed, the door panel 06 elastically contacts the protrusions 35a, 35b at the tip 26c of the hollow seal portion 26, and the tip 26c side is crushed and deformed, while the support wall 34 elastically contacts the convex portion 26d at the other end 26b of the hollow seal portion 26. Therefore, the tip 26c side of the hollow seal portion 26 is easily elastically deformed, and the protrusions 35a, 35b elastically contact the outer surface of the door panel 06, which prevents the door from closing easily and improves the sealing performance between the door panel 06 and the door panel 06. Second Embodiment FIG. 5 shows a second embodiment of an automotive weatherstrip according to the present invention, in which the arrangement of the protrusion 30, second retaining lip 31, and second protrusion 32 provided on the vehicle exterior side wall 24 is opposite to that in the first embodiment.

[0044] In other words, the protrusion 30 is positioned near the joint between the upper end of the vehicle exterior side wall 24 and the connecting wall 25, and the second retaining lip 31 and the second protrusion 32 are positioned at the original position of the protrusion 30, away from the connecting wall 25.

[0045] The other components, such as the seal lip 36, the first holding lip 27, and the abutting portion 28, are the same as those in the first embodiment.

[0046] Therefore, according to the second embodiment, when the welt portion 22 is fitted onto the flange portion 05, the second retaining lip 31 is flexed and deformed rearward and elastically contacts the second protrusion 32, and the reaction force causes the second retaining lip 31 to elastically contact the exterior side surface 08 of the flange portion 05 in a tight contact state, and the protrusion 30 also elastically contacts the exterior side surface 08. In addition, the seal lip 36 and the first retaining lip 27 also elastically contact the exterior side surface 08 in a tight contact state via the abutment portion 28.

[0047] Therefore, like the first embodiment, the second embodiment also has improved sealing properties against water, etc., making it possible to effectively prevent water from entering the vehicle interior due to submersion, for example, and to improve the efficiency of molding operations.

[0048] The present invention is not limited to the configurations of the above-described embodiments, and is applicable to vehicles such as hatchbacks and sliding door passenger cars in addition to ordinary passenger cars.

[0049] It is also possible to form a contact portion made of sponge rubber or the like on the outer surface of the second holding lip 31, which is expected to further improve the sealing performance.

[0050] Furthermore, the water pressure acting between the vehicle exterior side surface 08 and the vehicle exterior side wall 24 may be caused by, for example, the water pressure of car wash water, in addition to when the vehicle 01 is submerged in water due to a natural disaster such as a flood.

[0051] As an example of the automotive weather strip based on the embodiment described above, there are the following aspects.

[0052] One aspect of this is an automotive weatherstrip that includes a welt portion that is fitted onto a flange portion formed along the edge of the door opening of the vehicle body and that has a substantially U-shaped cross section formed by an interior side wall, an exterior side wall, and a connecting wall that connects both side walls, and a hollow seal portion that is formed integrally with the outer surface of the exterior side wall and with which the door panel elastically contacts when the door is closed, and at the tip end of the exterior side wall opposite the connecting wall, a seal lip that abuts the outer surface of the flange portion when the welt portion is attached to the flange portion, and a first retaining lip that is positioned more inward than the seal lip and abuts the outer surface of the flange portion, and abutment portions made of sponge material are formed on the outer surfaces of the seal lip and the first retaining lip that abut against the exterior side surface of the flange portion when the welt portion is attached to the flange portion, and a first protrusion that elastically contacts the abutment portion of the first retaining lip when the welt portion is attached to the flange portion is formed at a position toward the tip end of the inner surface of the exterior side wall.

[0053] According to this aspect of the invention, when the welt portion is attached to the flange portion, the abutment portion of the seal lip provided at the tip of the exterior side wall of the welt portion and the abutment portion of the first retaining lip abut against the exterior side surface of the flange portion, providing a double seal. In addition, the first retaining lip elastically abuts against the first protrusion via the abutment portion, applying a reaction force toward the flange portion, thereby increasing the abutment reaction force against the flange portion.

[0054] Therefore, high sealing performance can be ensured at all points between the flange and the welt, and as a result, even if the vehicle is submerged in water due to a flood or other cause and water pressure is applied between the flange and the welt, water, mud, etc. can be prevented from entering the vehicle interior.

[0055] In particular, the first retaining lip has a contact portion at its tip that resiliently contacts the first protrusion and the resulting reaction force resiliently contacts the flange, further improving the sealing performance between the contact portion and the flange, thereby more effectively preventing water, mud, and the like from entering the vehicle interior.

[0056] Furthermore, unlike the conventional technology described above, the present invention does not ensure sealing by changing the structure of the clip, but rather by integrating the seal lip, first retaining lip, abutment portion, and first protrusion portion into the welt portion to ensure sealing, thereby improving the efficiency of molding and assembly work and reducing molding work costs.

[0057] More preferably, a protrusion made of a sponge material is provided on the inner surface of the outer side wall portion, which is in elastic contact with the outer side surface of the flange portion when the welt portion is attached to the flange portion.

[0058] More preferably, the inner surface of the outer side wall of the vehicle is provided with a second retaining lip that abuts against the outer side surface of the flange portion when the welt portion is attached to the flange portion, and a second protrusion with which the back surface of the second retaining lip elastically contacts.

[0059] More preferably, the seal lip and the first holding lip are formed from the same solid material as the welt portion. [Explanation of symbols]

[0060] 01...Automobile 02...Front door 03...Body opening 05...Flange 06...Door panel 08...Vehicle outside side 21...Automotive weather strips 22...Welt 23...Inside wall of the car 24...Outside side wall of the vehicle 24a...Tip 25…Connecting wall 26...Hollow seal part 27...First retaining lip 27a...Tip 28...Contact part 29...First protrusion 30...Protrusion 31...Second retaining lip 32...Second protrusion 36...Seal lip 36a...Tip 36b...Inner

Claims

1. A weatherstrip for an automobile, comprising: a welt portion that is fitted to and attached to a flange portion formed along the edge of a door opening of a vehicle body, the welt portion having a substantially U-shaped cross section formed by an interior side wall, an exterior side wall, and connecting walls that connect the both side walls; and a hollow seal portion that is integrally formed on the outer surface of the exterior side wall and with which a door panel elastically contacts when the door is closed, a seal lip is provided at a tip end portion of the vehicle exterior side wall on a side opposite to the connecting wall, and a first retaining lip is provided which is positioned more inward than the seal lip, a contact portion made of a sponge material that contacts the vehicle exterior side surface of the flange portion when the welt portion is attached to the flange portion is provided on each outer surface of the seal lip and the first retaining lip, A weatherstrip for an automobile, characterized in that a first protrusion is provided on the inner surface of the outer side wall of the vehicle, with which the abutment portion on the first retaining lip side elastically contacts when the welt portion is attached to the flange portion.

2. 2. The weather strip for an automobile according to claim 1, A weatherstrip for an automobile, characterized in that a protrusion made of sponge material is provided on the inner surface of the outer side wall portion of the vehicle, which protrudes and elastically contacts the outer side surface of the flange portion when the welt portion is attached to the flange portion.

3. 2. The weather strip for an automobile according to claim 1, a second retaining lip provided on the inner surface of the outer side wall of the vehicle, the second retaining lip contacting the outer side surface of the flange portion when the welt portion is attached to the flange portion, and a second protrusion with which the back surface of the second retaining lip makes elastic contact.

4. 2. The weather strip for an automobile according to claim 1, 10. A weather strip for an automobile, wherein the seal lip and the first retaining lip are formed from the same solid material as the welt portion.

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